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Considering a rainwater system for your home? Our comprehensive rainwater harvesting FAQ provides answers to common questions from Texas homeowners – including planning rainwater system design, filtration methods, water quality, and routine maintenance.


Planning Your Rainwater System

I’m building a new house, what’s the fastest way to get a quote?

Send us your plan set and we’ll handle the rest.
We’ll review your roof layout, calculate potential collection, recommend a tank size, and send over a tailored estimate. No need to have all the answers up front, we’re here to guide you through it.

👉 Send plans here. 

What’s the difference between rainwater system types?

There are a few main types of rainwater harvesting systems, and the right fit depends on how you plan to use the water.

  • Whole-house potable systems are designed to supply all indoor fixtures with high-quality, drinkable water. These require multi-stage filtration and disinfection for safe, everyday use.

  • Irrigation systems are simpler and more cost-effective, with lighter filtration that’s suitable for watering landscapes, gardens, or livestock.

  • Impervious cover offset systems are tailored to help meet impervious cover requirements during permitting. We love turning a requirement into a reward – captured rainwater can be used for things like pool fill or drought-tolerant landscaping.

  • Emergency backup systems are smaller potable setups designed to serve as a secondary water source alongside municipal or well water – providing resilience during outages, droughts, or disruptions.

We’ll help you navigate the options and choose the system that fits your goals, site, and budget.

What is a wet vs dry pipe system?

A wet pipe rainwater system uses underground piping to convey water from your roof to the storage tank. In this setup, the downspouts often stay partially full between rain events – hence the name.

Wet pipe systems allow us to maximize your collection area and offer more flexibility in tank placement, especially when the tank can’t be located directly next to the roof.

In contrast, a dry pipe system routes water straight from gutters to the tank through 1–2 direct downspouts, and the pipes fully drain between rains, leaving them ‘dry’. Both options have their place, and our experienced team can help determine which design is the best fit for your site.

Why is rainwater system design so important?

Rainwater systems aren’t plug-and-play. Every site is different and requires different approaches. Rooflines, topography, usage goals, and aesthetics all factor in.

A well-designed system ensures you collect enough water, maintain quality, and avoid costly mistakes down the line. It’s the difference between something that just works and something that works well for decades.

I want a rain barrel – can y’all do that?

We don’t install small rain barrels, but we’re glad you’re thinking about collecting rain! We specialize in full-scale rainwater harvesting systems, typically starting at 1,000 gallons.

If you’re looking for a traditional rain barrel setup, your best bet is to check with a local nursery or garden center. That said, we always encourage folks to think bigger: even a 500 gallon barrel can fill and overflow in a single Texas storm. It’s often more cost-effective (and rewarding) to size up from the start.

If you’re curious about what’s possible for your property, we’re happy to talk it through.

Can you install my tank underground?

We can, and we do install underground rainwater systems but its with a heavy dose of upfront caution.

Underground rainwater tanks are significantly more expensive than above-ground options. They often require engineered concrete pours and specialized tanks. In the majority of residential cases, these requirements make an underground project cost-prohibitive.

That said, if going underground is important for your layout or aesthetics, we’re happy to walk you through what it would take and see if it makes sense for your site and budget.


Design to Install Process

How soon can I get a rainwater system?

It depends on the scope of your project and our current schedule. Smaller systems or upgrades can often be scheduled sooner through our service department.

The sooner you reach out, the better. When we’re brought in early – especially on new construction – we can more seamlessly dovetail into your build schedule and lend our best build practices to the process.

👉 Start the conversation here

How long does installation take?

Most full rainwater system installations are completed in 4-5 business days.

Some smaller systems or component upgrades can be wrapped up faster, while more complex builds may take a bit longer, especially if we’re coordinating around other trades.

What happens after installation?

Once installation wraps up, it’s time to wait on the rain, or schedule a water delivery if you’d like to fill your tank right away. 

We’ll then return for a complimentary Fire-Up with a senior member of our service team. This hands-on visit ensures everything is running properly and gives you a clear understanding of how to operate and maintain your system.


Water In, Water Out: Collection VS Usage

How much water do I use?

Every household is different, but on average, a family of four uses about 75–100 gallons of water per person per day. That adds up quickly when you’re accounting for showers, laundry, dishes, and general use.

We’ll help you estimate your actual water needs based on your lifestyle and goals – whether you want to go fully off-grid, supplement your well, or use for irrigation.

How much water can I collect?

A good rule of thumb: for every 1 inch of rain, you can collect about 0.6 gallons per square foot of roof area. So, a 2,000-square-foot roof can yield over 1,200 gallons from a single inch of rain.

But good design makes all the difference. It’s not just about the size of your roof, it’s about how the water is captured, conveyed, and stored. Details like gutters, pipe sizing/fittings, elevation changes, and overflow handling all impact how much of that rain you actually get to keep.

We design every system to capture the maximum amount of usable water your roof and site can provide – and to make sure it’s clean, reliable, and ready when you need it.

Can I collect rainwater off a shingled roof?

While our preference is to collect from a standing seam metal roof, you can collect rainwater off an asphalt shingle roof. That said, composite shingles are petroleum-based, so if you’re planning to drink the water, we recommend installing a reverse osmosis (RO) unit at your kitchen sink for added peace of mind.

For non-potable uses like irrigation or pool fill, no additional filtration is usually needed beyond our standard debris and sediment removal.

What if my roof isn’t big enough for my needs?

If your roof can’t meet your full water demand, we can design that supplements with municipal or well water. We can also explore options for expanding your collection area. Sometimes that means capturing from an additional structure, such as a carport, barn, or shed. We’re here to help brainstorm what’s possible for your property and design a system that makes the most of what you’ve got.

Our team always designs with the right expectations in mind, not just the biggest possible tank. If rainwater can’t fully meet your needs, we’ll tell you. Our goal is to deliver a reliable system, not one that overpromises.


RAINWATER SYSTEM INSTALLATION

Does Harvest Rain install in my area?

We’re based in Dripping Springs, Texas, and most of our work is concentrated within a 75-mile radius. Our regular service area includes:

Dripping Springs, Driftwood, Rollingwood, West Lake Hills, Spicewood, Wimberley, Leander, Blanco, Johnson City, Fredericksburg, and Boerne, along with other nearby Hill Country communities.

We also travel farther for larger installs, so even if you’re outside the area, it’s worth reaching out. We’re always happy to discuss what’s possible based on your location and project scope.

Is rainwater harvesting legal in Texas?
Yes, rainwater harvesting is legal and encouraged in Texas. Many municipalities even offer incentives to support installation.
Are there incentives or rebates for installing a rainwater harvesting system?

In many parts of Texas, yes but it depends on where you are and how the system will be used. Some local governments, water districts, and utilities offer rebates or tax incentives for rainwater collection, especially for potable systems or irrigation offsets. These programs are always changing, so we keep an updated overview here:  Rainwater rebates & tax benefits

How long does installation take?
Although it depends on system size and complexity, most whole-home residential rainwater installations are completed within 5 business days. Smaller projects are often completed in 1-2 days.

Filtration & Water Quality

Is collected rainwater safe to drink?

Yes, rainwater is safe to drink when properly filtered and disinfected. Our potable systems use time-tested methods to ensure some of the highest quality drinking water on the planet. Read more here. 

What kind of filtration is used for potable water systems?

Our systems utilize several stages of filtration ending in a simple 3 step process: 1) Sediment filter to remove debris 2) Carbon filter to improve taste and odor 3) High-flow UV light for chemical-free disinfection. No chlorine, salts, or softeners required!

Do I need to disinfect rainwater for cows, horses or other livestock?
No, disinfection is not required for livestock use. Most animals tolerate untreated rainwater well. However, we do recommend basic pre-tank filtration to remove debris and keep the water clean for your animals.
Where does the filtration set up go?

Many of our customers will choose to have their filtration stations installed along a garage wall, other enclosed area, or well/pump house that allows for easy access and is safe from the elements. See a typical residential rainwater filtration set up here. 


Maintenance

What maintenance is required for a rainwater system?

Like any home utility, a potable rainwater system needs regular maintenance to keep it safe, efficient, and long-lasting.

Typical tasks include: Inspecting gutters, cleaning screens, and replacing filters, and UV bulbs. We’ve put together a detailed maintenance guide that covers what to do (and how often) to keep your rainwater system running smoothly: Read our full maintenance guide

Does Harvest Rain offer service maintenance?

We do! Our dedicated service team maintains both systems we’ve installed and those we didn’t. Whether you need a one-time repair or ongoing upkeep, we’ve got you covered.

We also offer annual Service Maintenance Agreements for customers who want peace of mind and priority scheduling. These include quarterly visits to check filters, inspect components, and keep everything running smoothly year-round.

If I don’t maintain my system, could I get sick?
Yes. Neglected systems can become contaminated. Regular maintenance including replacing filters and UV lights ensures safe water. Read more here. 

MORE ABOUT HARVEST RAIN

How many rainwater systems has Harvest Rain designed and installed?

As of 2025, we’ve completed more than 500 full design-build projects and installed over 25 million gallons of rainwater storage across Texas. 

How long have you been in business?

Our roots go back nearly 30 years to the founding of Tank Town in 1993 by Richard and Suzie Heinichen. Long before rainwater was mainstream, Richard and Suzie saw the need for sustainable, high-quality water in the Hill Country, and helped lead the charge.

Widely known as the father of Hill Country rainwater, Richard didn’t just build systems, he helped shape laws and set the standard for safe potable collection across Texas. He then went on to found Richard’s Rainwater! 

In 2015, we acquired Tank Town and rebranded as Harvest Rain, carrying forward that legacy with pride. Today, we combine decades of experience with modern tools, expert design, and a commitment to doing things the right way.


Contact us

  • Physical Address
    169 Russell Lane
    Dripping Springs,TX
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  • Mailing Address
    1450 Hwy 290 #91
    Dripping Springs,TX
    78620

Harvest Rain